Possibly arrest a famous French writer (6)
I believe the answer is:
sartre
'french writer' is the definition.
(I've seen this in another clue)
'possibly arrest' is the wordplay.
'possibly' indicates anagramming the letters.
'arrest' is an anagram of 'SARTRE'.
'a famous' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for sartre that I've seen before include "Jean-Paul -, Fr. author" , "Jean-Paul --, French writer and philosopher" , "Sooner" , "Jean Paul -, French author" , "Jean-Paul --, French author and philosopher" .)